Also called pompano, butterfly-shell clam. a small clam, Donax variabilis, abundant in the intertidal zone of eastern and southern U.S. coastal beaches, having fanlike bands of various hues, the paired empty shells often spread in a butterfly shape.
any similar clam, especially of the genus Donax.
a soft, whitish rock made up of fragments of marine shells and coral, used as a building material.
1830-40, Americanism; < Spanish: literally, shellfish, equivalent to Old Spanishcoc(a) shellfish (< Latinconcha; see conch) + -ina-ine1